FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\atl
Open Close
General Information
Symbol
Dmel\atl
Species
D. melanogaster
Name
atlastin
Annotation Symbol
CG6668
Feature Type
FlyBase ID
FBgn0039213
Gene Model Status
Stock Availability
Gene Summary
atlastin (atl) encodes a dynamin-like membrane-bound GTPase that mediates endoplasmic reticulum membrane fusion in a GTP-dependent fashion. It is required for normal growth of muscles and synapses at the neuromuscular junction. [Date last reviewed: 2018-11-08] (FlyBase Gene Snapshot)
Also Known As

D-atlastin, dAtl

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
3-85
RefSeq locus
NT_033777 REGION:24625671..24634714
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (29 terms)
Molecular Function (8 terms)
Terms Based on Experimental Evidence (8 terms)
CV Term
Evidence
References
enables GTP binding
inferred from mutant phenotype
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from physical interaction with UniProtKB:Q8I0P1
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
enables GTP binding
inferred from biological aspect of ancestor with PANTHER:PTN000079086
inferred from electronic annotation with InterPro:IPR015894, InterPro:IPR036543
inferred from biological aspect of ancestor with PANTHER:PTN000079086
Biological Process (14 terms)
Terms Based on Experimental Evidence (14 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from genetic interaction with FLYBASE:Rtnl1; FB:FBgn0053113
inferred from mutant phenotype
inferred from mutant phenotype
involved_in Golgi organization
inferred from mutant phenotype
involved_in membrane fusion
inferred from direct assay
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from direct assay
inferred from mutant phenotype
involved_in reticulophagy
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000844237
inferred from biological aspect of ancestor with PANTHER:PTN000844237
Cellular Component (7 terms)
Terms Based on Experimental Evidence (7 terms)
CV Term
Evidence
References
located_in cytoplasm
inferred from direct assay
inferred from high throughput direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
located_in Golgi apparatus
inferred from direct assay
is_active_in membrane
inferred from direct assay
located_in membrane
inferred from direct assay
colocalizes_with microtubule
inferred from direct assay
Terms Based on Predictions or Assertions (0 terms)
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the TRAFAC class dynamin-like GTPase superfamily. GB1/RHD3 GTPase family. GB1 subfamily. (Q9VC57)
Catalytic Activity (EC/Rhea)
GTPase activity
RHEA 19669:
Summaries
Gene Snapshot
atlastin (atl) encodes a dynamin-like membrane-bound GTPase that mediates endoplasmic reticulum membrane fusion in a GTP-dependent fashion. It is required for normal growth of muscles and synapses at the neuromuscular junction. [Date last reviewed: 2018-11-08]
Gene Group (FlyBase)
UNCLASSIFIED GTPASES -
This group comprises GTPases that do not classify under other groups in FlyBase.
Protein Function (UniProtKB)
Membrane-anchored GTPase that mediates the GTP-dependent fusion of endoplasmic reticulum (ER) membranes, maintaining the continuous ER network (PubMed:19633650, PubMed:38509071). It facilitates the formation of three-way junctions where ER tubules intersect. Two atlastin-1 on neighboring ER tubules bind GTP and form loose homodimers through the GB1/RHD3-type G domains and 3HB regions. Upon GTP hydrolysis, the 3HB regions tighten, pulling the membranes together to drive their fusion. After fusion, the homodimer disassembles upon release of inorganic phosphate (Pi). Subsequently, GDP dissociates, resetting the monomers to a conformation ready for a new fusion cycle (PubMed:19633650, PubMed:25407413). May also regulate more or less directly Golgi biogenesis (PubMed:19341724). May also regulate microtubule polymerization and Golgi biogenesis. Required for dopaminergic neurons survival and the growth of muscles and synapses at neuromuscular junctions (PubMed:19341724).
(UniProt, Q9VC57)
Summary (Interactive Fly)

dynamin-family transmembrane GTPase that drives endoplasmic reticulum membrane fusion in a GTP-dependent fashion - self-associating protein that is able to form trans-oligomeric complexes - required for normal growth of muscles and synapses at the neuromuscular junction

Gene Model and Products
Number of Transcripts
3
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\atl for information on other features

To submit a correction to a gene model please use the Contact FlyBase form

Protein Domains (via Pfam)
Isoform displayed:
Pfam protein domains
InterPro name
classification
start
end
Protein Domains (via SMART)
Isoform displayed:
SMART protein domains
InterPro name
classification
start
end
Structure
Protein 3D structure   (Predicted by AlphaFold)   (AlphaFold entry Q9VC57)

If you don't see a structure in the viewer, refresh your browser.
Model Confidence:
  • Very high (pLDDT > 90)
  • Confident (90 > pLDDT > 70)
  • Low (70 > pLDDT > 50)
  • Very low (pLDDT < 50)

AlphaFold produces a per-residue confidence score (pLDDT) between 0 and 100. Some regions with low pLDDT may be unstructured in isolation.

Experimentally Determined Structures
Crossreferences
PDB - An information portal to biological macromolecular structures
Comments on Gene Model

Tissue-specific extension of 3' UTRs observed during later stages (FBrf0218523, FBrf0219848); all variants may not be annotated

Gene model reviewed during 5.49

Low-frequency RNA-Seq exon junction(s) not annotated.

Annotated transcripts do not represent all supported alternative splices within 5' UTR.

Gene model reviewed during 5.55

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0084656
2889
541
FBtr0084657
3207
541
FBtr0345218
2907
541
Additional Transcript Data and Comments
Reported size (kB)
Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0084036
60.9
541
6.51
FBpp0084037
60.9
541
6.51
FBpp0311413
60.9
541
6.51
Polypeptides with Identical Sequences

The group(s) of polypeptides indicated below share identical sequence to each other.

541 aa isoforms: atl-PA, atl-PB, atl-PC
Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
Subunit Structure (UniProtKB)

Monomeric and homodimeric. The homodimer, transiently formed by two molecules on opposing membranes, is the active form mediating ER membrane fusion (PubMed:19633650). Interacts with spas; interaction may regulate microtubule dynamics (PubMed:19341724).

(UniProt, Q9VC57)
Domain

The GB1/RHD3-type G domain mediates GTP binding and hydrolysis as well as homodimerization.

The two three-helix bundle (3HB) regions in the homodimer are loosely associated initially, but they tighten upon GTP hydrolysis, facilitating the fusion of membranes.

(UniProt, Q9VC57)
Crossreferences
Linkouts
Sequences Consistent with the Gene Model
Nucleotide / Polypeptide Records
 
Mapped Features

Click to get a list of regulatory features (enhancers, TFBS, etc.) and gene disruptions (point mutations, indels, etc.) within or overlapping Dmel\atl using the Feature Mapper tool.

External Data
Crossreferences
Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
Linkouts
Expression Data
Testis-specificity index

The testis specificity index was calculated from modENCODE tissue expression data by Vedelek et al., 2018 to indicate the degree of testis enrichment compared to other tissues. Scores range from -2.52 (underrepresented) to 5.2 (very high testis bias).

2.57

Transcript Expression
Polypeptide Expression
immunolocalization
Stage
Tissue/Position (including subcellular localization)
Reference
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

atl is detected in neuropil regions of the brain and ventral nerve cord of third instar larvae. It is also detected in motor axon bundles emanating from the ventral ganglia. It is highly expressed throughout the cytolasm of body wall muscles and present at lower levels in the proximal parts of presynaptic arbors. It is not present in synaptic boutons.

In early oogenesis, atl protein is expressed in the posterior compartment of the egg chamber and in the membrane and cytoplasm of nurse cells. At oogenesis stage 9 it is found in the anterior cytoplasm of the oocyte. It then disapeears from this domain and at stage 10 atl protein is strongly expressed in follicle cells. In the adult brain it is expressed ubiquitously, with some cellls, including a subset of dopaminergic neurons expressing atl strongly.

Marker for
 
Subcellular Localization
CV Term
Evidence
References
located_in cytoplasm
inferred from direct assay
inferred from high throughput direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from direct assay
located_in Golgi apparatus
inferred from direct assay
is_active_in membrane
inferred from direct assay
located_in membrane
inferred from direct assay
colocalizes_with microtubule
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\atl in JBrowse
RNA-Seq by Region - Search RNA-Seq expression levels by exon or genomic region
Reference
See Gelbart and Emmert, 2013 for analysis details and data files for all genes.
Developmental Proteome: Life Cycle
Developmental Proteome: Embryogenesis
External Data and Images
Linkouts
BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
Flygut - An atlas of the Drosophila adult midgut
Images
FlyExpress - Embryonic expression images (BDGP data)
  • Stages(s) 1-3
  • Stages(s) 4-6
  • Stages(s) 7-8
  • Stages(s) 9-10
  • Stages(s) 11-12
  • Stages(s) 13-16
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 22 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 21 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of atl
Transgenic constructs containing regulatory region of atl
Aberrations (Deficiencies and Duplications) ( 1 )
Inferred from experimentation ( 1 )
Inferred from location ( 6 )
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
For more details about a specific phenotype click on the relevant allele symbol.
Lethality
Allele
Sterility
Allele
Other Phenotypes
Allele
Phenotype manifest in
Allele
microtubule & embryonic/larval somatic muscle, with Scer\GAL4C57
microtubule & embryonic/larval somatic muscle (with Df(3R)Exel7357)
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (13)
14 of 14
Yes
Yes
13 of 14
No
Yes
12 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (15)
14 of 14
Yes
Yes
13 of 14
No
Yes
11 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
2 of 14
No
Yes
2 of 14
No
Yes
2 of 14
No
Yes
2 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
Mus musculus (laboratory mouse) (17)
14 of 14
Yes
Yes
13 of 14
No
Yes
12 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
3 of 14
No
Yes
2 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
Xenopus tropicalis (Western clawed frog) (23)
8 of 13
Yes
Yes
7 of 13
No
Yes
7 of 13
No
Yes
2 of 13
No
Yes
2 of 13
No
Yes
2 of 13
No
Yes
2 of 13
No
Yes
2 of 13
No
Yes
1 of 13
No
No
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
No
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
No
1 of 13
No
No
1 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
No
1 of 13
No
Yes
Danio rerio (Zebrafish) (26)
14 of 14
Yes
Yes
13 of 14
No
Yes
12 of 14
No
Yes
4 of 14
No
Yes
4 of 14
No
Yes
3 of 14
No
Yes
2 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
No
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
1 of 14
No
Yes
Caenorhabditis elegans (Nematode, roundworm) (3)
12 of 14
Yes
Yes
7 of 14
No
Yes
1 of 14
No
No
Anopheles gambiae (African malaria mosquito) (1)
12 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (3)
6 of 13
Yes
Yes
4 of 13
No
Yes
3 of 13
No
Yes
Saccharomyces cerevisiae (Brewer's yeast) (0)
Schizosaccharomyces pombe (Fission yeast) (0)
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:atl. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Human Disease Associations
FlyBase Human Disease Model Reports
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 14 )
Potential Models Based on Orthology ( 3 )
Modifiers Based on Experimental Evidence ( 4 )
Disease Associations of Human Orthologs (via DIOPT v9.1 and OMIM)
Note that ortholog calls supported by only 1 or 2 algorithms (DIOPT score < 3) are not shown.
Functional Complementation Data
Functional complementation data is computed by FlyBase using a combination of the orthology data obtained from DIOPT and OrthoDB and the allele-level genetic interaction data curated from the literature.
Interactions
Summary of Physical Interactions
Summary of Genetic Interactions
Interaction Browsers

Please look at the allele data for full details of the genetic interactions
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
External Data
Subunit Structure (UniProtKB)
Monomeric and homodimeric. The homodimer, transiently formed by two molecules on opposing membranes, is the active form mediating ER membrane fusion (PubMed:19633650). Interacts with spas; interaction may regulate microtubule dynamics (PubMed:19341724).
(UniProt, Q9VC57 )
Linkouts
BioGRID - A database of protein and genetic interactions.
DroID - A comprehensive database of gene and protein interactions.
MIST (genetic) - An integrated Molecular Interaction Database
MIST (protein-protein) - An integrated Molecular Interaction Database
Pathways
Signaling Pathways (FlyBase)
Metabolic Pathways
FlyBase
External Links
External Data
Linkouts
Class of Gene
Genomic Location and Detailed Mapping Data
Chromosome (arm)
3R
Recombination map
3-85
Cytogenetic map
Sequence location
FlyBase Computed Cytological Location
Cytogenetic map
Evidence for location
96A13-96A13
Limits computationally determined from genome sequence between P{PZ}crb07207&P{PZ}BRWD305842 and P{EP}CycB3EP3127
Experimentally Determined Cytological Location
Cytogenetic map
Notes
References
Experimentally Determined Recombination Data
Location
Left of (cM)
Right of (cM)
Notes
Stocks and Reagents
Stocks (26)
Genomic Clones (20)
cDNA Clones (269)
 

Please Note This section lists cDNAs and ESTs that fall within the genomic extent of the gene model, which may include cDNAs and ESTs of genes within introns, or of overlapping genes. Please see JBrowse for alignment of the cDNAs and ESTs to the gene model.

cDNA clones, fully sequenced
BDGP DGC clones
Other clones
    Drosophila Genomics Resource Center cDNA clones

    For each fully sequenced cDNA the DGRC maintains various forms of the cDNA (e.g tagged or untagged) in several different host vectors for subsequent cloning and expression in Drosophila and Drosophila cell lines.

    cDNA Clones, End Sequenced (ESTs)
    Other clones
    RNAi and Array Information
    Linkouts
    DRSC - Results frm RNAi screens
    Antibody Information
    Laboratory Generated Antibodies
    Commercially Available Antibodies
     
    Cell Line Information
    Publicly Available Cell Lines
     
      Other Stable Cell Lines
       
        Other Comments
        Relationship to Other Genes
        Source for database merge of
        Additional comments
        Nomenclature History
        Source for database identify of

        Source for identity of: atl CG6668

        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (11)
        Reported As
        Secondary FlyBase IDs
          Datasets (0)
          Study focus (0)
          Experimental Role
          Project
          Project Type
          Title
          Study result (0)
          Result
          Result Type
          Title
          External Crossreferences and Linkouts ( 52 )
          Sequence Crossreferences
          NCBI Gene - Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide.
          GenBank Nucleotide - A collection of sequences from several sources, including GenBank, RefSeq, TPA, and PDB.
          GenBank Protein - A collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB.
          RefSeq - A comprehensive, integrated, non-redundant, well-annotated set of reference sequences including genomic, transcript, and protein.
          UniProt/GCRP - The gene-centric reference proteome (GCRP) provides a 1:1 mapping between genes and UniProt accessions in which a single 'canonical' isoform represents the product(s) of each protein-coding gene.
          UniProt/Swiss-Prot - Manually annotated and reviewed records of protein sequence and functional information
          UniProt/TrEMBL - Automatically annotated and unreviewed records of protein sequence and functional information
          Other crossreferences
          AlphaFold DB - AlphaFold provides open access to protein structure predictions for the human proteome and other key proteins of interest, to accelerate scientific research.
          BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
          DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
          EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
          FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
          FlyMine - An integrated database for Drosophila genomics
          KEGG Genes - Molecular building blocks of life in the genomic space.
          MARRVEL_MODEL - MARRVEL (model organism gene)
          PDB - An information portal to biological macromolecular structures
          Linkouts
          BioGRID - A database of protein and genetic interactions.
          Drosophila Genomics Resource Center - Drosophila Genomics Resource Center (DGRC) cDNA clones
          DroID - A comprehensive database of gene and protein interactions.
          DRSC - Results frm RNAi screens
          Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
          FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
          FlyCyc Genes - Genes from a BioCyc PGDB for Dmel
          Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
          Flygut - An atlas of the Drosophila adult midgut
          iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
          Interactive Fly - A cyberspace guide to Drosophila development and metazoan evolution
          MIST (genetic) - An integrated Molecular Interaction Database
          MIST (protein-protein) - An integrated Molecular Interaction Database
          References (100)